Characterization of a high-purity germanium detector for small-animal SPECT

We present an initial evaluation of a mechanically cooled, high-purity germanium double-sided strip detector as a potential gamma camera for small-animal SPECT. It is 90 mm in diameter and 10 mm thick with two sets of 16 orthogonal strips that have a 4.5 mm width with a 5 mm pitch. We found an energ...

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Bibliographic Details
Published in:Physics in medicine & biology 2011-09, Vol.56 (18), p.5877-5888
Main Authors: Johnson, Lindsay C, Campbell, Desmond L, Hull, Ethan L, Peterson, Todd E
Format: Article
Language:English
Subjects:
Animals
Electromagnetic Fields
Equipment Design
Gamma Cameras
Germanium
Image Enhancement - instrumentation
Image Enhancement - methods
Models, Animal
Particle Accelerators - instrumentation
Phantoms, Imaging
Reproducibility of Results
Sensitivity and Specificity
Tomography, Emission-Computed, Single-Photon - instrumentation
Tomography, Emission-Computed, Single-Photon - methods
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Summary:We present an initial evaluation of a mechanically cooled, high-purity germanium double-sided strip detector as a potential gamma camera for small-animal SPECT. It is 90 mm in diameter and 10 mm thick with two sets of 16 orthogonal strips that have a 4.5 mm width with a 5 mm pitch. We found an energy resolution of 0.96% at 140 keV, an intrinsic efficiency of 43.3% at 122 keV and a FWHM spatial resolution of approximately 1.5 mm. We demonstrated depth-of-interaction estimation capability through comparison of pinhole acquisitions with a point source on and off axes. Finally, a flood-corrected flood image exhibited a strip-level uniformity of less than 1%. This high-purity germanium offers many desirable properties for small-animal SPECT.
ISSN:0031-9155
1361-6560
DOI:10.1088/0031-9155/56/18/007